Sump help

[freeze]

Sorry of there is confusion. The gap on the bottom is only on that one half of the sump. So then trapazoid as return would then naturally flow to the upper chamber through the bottom, would fill that and overflow to the lower as a return? Only question would be is because the bottom is open the sand bed in the fuge would spill into the skimmer area so I might have to throw something in anyways.

Thinking I could use the sealed lower chamber as the sump and the trapazoid as my fuge and just build a baffle and then both would drain into the upper chamber as the return...